qin-yu

How do I Install CUDA on Ubuntu 18.04?

• How do I Install CUDA on Ubuntu 18.04?
  • (DON'T) Add apt repo and install CUDA Toolkit (BAD solution)
  • Download and install from official website
  • Problem: what if I want both 10.1 and 10.0?
  • Reference:

(DON'T) Add apt repo and install CUDA Toolkit (BAD solution)

qin-yu

How to fix No module named 'pip._internal'

$ pip3

Traceback (most recent call last):
File "/home/qinyu/.local/bin/pip3", line 7, in <module>
   from pip._internal import main
ModuleNotFoundError: No module named 'pip._internal'

qin-yu

If you have > 1 gpu, the first gpu is #0 and the second is therefore #1, etc.

$ CUDA_VISIBLE_DEVICES=1 python3 ~/.../faceswap.py train -A ~/.../face1 -B ~/.../face2 -m ~/.../models -p

qin-yu

How to move Mac Time Machine backup from one disk to another (or two) disk(s) THE RIGHT WAY

(In fact, you can have more than one Time Machine backup disks, MacOS will backup your whole system alternately into them)

!!　DO NOT USE APPLE OFFICIAL APPROACH (DRAG-N-DROP), WHICH COSTS WEEKS TO FINISH WRITING 10x DISKS !!

1. Open Disk Utility (/Applications/Utilities/Disk Utility.app).
2. Check the format of your new backup drive. It needs to be a GUID partition and formatted as Mac OS Extended (Journaled).
3. Temporarily turn Time Machine off.
4. In Disk Utility select the new backup drive.

qin-yu

To fix Ubuntu mic no input problem, install pavucontrol:

$ sudo apt-get install pavucontrol
$ sudo pavucontrol

Reference: Sound Input device (microphone) not working

qin-yu

How to Reinstall & Manage Multiple Pythons

Qin Yu, Apr 2020

• How to Reinstall & Manage Multiple Pythons
• How to Install & Manage Multiple Pythons (on Ubuntu 18.04)
  • Install pyenv
    • Auto-installation (not as auto as it sounds)
    • Manual installation
    • Some features of pyenv
• Usage

qin-yu

How to search for a mathematics symbol of which you don't know the name?

When typing in Latex, I often desperately wonder what are those weird mathematics symbols called???

Solution:

Go to the Detexify website and draw it!

p.s. it turned out to be in a GitHub repo: kirel/detexify.

qin-yu

Shortcuts not working on Mac/MacOS

One possibility is that the keyboard setting is bad for the massive amount of shortcuts we are using. The system default input source is ABC - Extended, which causes ⌥+⇧+f to input a ̰ character. For example, in VS Code, to format a document, one uses ⌥+⇧+f, which inputs ̰ instead of executing the shortcut.

Solution

Just change the ABC - Extended input source to ABC.

qin-yu

How to format MATLAB files?

1. Go to the GitHub repo of MBeautifier and clone/download it to anywhere as a library/package for MATLAB.
2. Add the root directory of MBeautifier to the MATLAB path, e.g. on MacOS:

• Add the folder /path/to/MBeautifier to the beginning of the search path on a UNIX® system:

oldpath = path;
path('/path/to/MBeautifier',oldpath)

3. Perform formatting on the currently active page of MATLAB Editor. Command:

qin-yu

SYSTEM is a function that returns an integer result, so declare a variable:

integer iret

and then change the call to:

iret = system(tmpline)

The Fortran standard does not allow calling a function as a subroutine. Indeed, earlier versions of our compiler did allow this, under some conditions, but the restrictions were not enough to avoid possible bad results and, after long debate, we decided that as the number of cases where this was harmless was small enough it was simpler to just make it an error. The problem has to do with mismatched assumptions about where arguments and return values get placed.